Matjaz Jerśić, Institute of Geography, University of LjubljanaJoze Lojk, Institute of Geography, University of LjubljanaLudvik Olas, Institute of Geography, University of LjubljanaMetod Vojvoda, Institute of Geography, University of Ljubljana

Djoko Jelić, Institute of Geography, University of LjubljanaMatjaz Jerśić, Institute of Geography, University of LjubljanaJoze Lojk, Institute of Geography, University of LjubljanaMetod Vojvoda, Institute of Geography, University of Ljubljana

Jerzy Kostrowicki, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Warsaw, PolandIvan Velchev, Department of Geography University of SofiaZdravko Borisov, Department of Geography University of Sofia